Java decompress the RAR compressed file with a password

RAR compression algorithms are not publicly available, so there are not many open-source projects in this regard

Fortunately, an open-source project named unrar supports extracting RAR files, but cannot compress rarfiles.

However, the direct use of unrar but does not support the rarfile decompression password, after multi-party search, finally found a support password on Google Code unrar version,: http://code.google.com/p/java-unrar/

This project depends on the jar package:

Commons-logging.jar is more commonly used, can download to the Apache Official Website

Gnu-crypto.jar can be downloaded at http://www.gnu.org/software/gnu-crypto/

The following is a simple decompression example:

Package com.ninemax.demo.rar; import Java. io. file; import Java. io. fileoutputstream; import Java. io. ioexception; import Java. io. outputstream; import Org. apache. commons. io. ioutils; import de. innosystec. unrar. archive; import de. innosystec. unrar. exception. rarexception; import de.innow.ec.unrar.rar file. fileheader;/*** RAR format compressed file decompression tool class * does not support RAR format compression * supports Chinese, support RAR compressed file Password * dependent jar package * commons-io.jar * commons-logging. Jar * java-unrar-decryption-supported.jar * gnu-crypto.jar ** @ author ninemax */public class rardecompressionutil {public static final string separator = file. separator; // ================================== RAR format ====== ==========================================// *** decompress the specified rarfile to the current folder * @ Param srcrar specifies the password set during decompression * @ Param password compression * @ throws ioexception */public static void unrar (string srcrar, string password) Throws ioexception {unrar (srcrar, null, password );} /*** decompress the specified RAR compressed file to the specified directory * @ Param srcrar specified RAR compressed file * @ Param destpath specified extract directory * @ Param password when compressing the file set password * @ throws ioexception */public static void unrar (string srcrar, string destpath, string password) throws ioexception {file srcfile = new file (srcrar); If (! Srcfile. exists () {return;} If (null = destpath | destpath. length () = 0) {unrar (srcfile, srcfile. getparent (), password); return;} unrar (srcfile, destpath, password );} /*** decompress the specified rarfile to the current folder * @ Param srcrarfile unzip the file * @ Param password the password set when compressing the file * @ throws ioexception */public static void unrar (File srcrarfile, string password) throws ioexception {If (null = srcrarfile |! Srcrarfile. exists () {Throw new ioexception ("the specified file does not exist. ");} unrar (srcrarfile, srcrarfile. getparent (), password );} /*** extract the specified rarfile to the specified path * @ Param srcrarfile the rarfile needs to be decompressed * @ Param destpath specifies the decompression path * @ Param password the password set when compressing the file * @ throws ioexception * /public static void unrar (File srcrarfile, string destpath, string password) throws ioexception {If (null = srcrarfile |! Srcrarfile. exists () {Throw new ioexception ("the specified compressed file does not exist.");} If (! Destpath. endswith (separator) {destpath + = separator;} Archive = NULL; outputstream unout = NULL; try {archive = new archive (srcrarfile, password, false ); fileheader = archive. nextfileheader (); While (null! = Fileheader) {If (! Fileheader. isdirectory () {// 1 obtain the corresponding destdirname and destfilenamestring destfilename = ""; string destdirname = ""; if (separator. equals ("/") {// non-Windows System destfilename = (destpath + fileheader. getfilenamew ()). replaceall ("\\\\", "/"); destdirname = destfilename. substring (0, destfilename. lastindexof ("/");} else {// Windows System destfilename = (destpath + fileheader. getfilenamew ()). replaceall ("/", "\\\\"); Destdirname = destfilename. substring (0, destfilename. lastindexof ("\");} // 2 create a folder file dir = new file (destdirname); If (! Dir. exists () |! Dir. isdirectory () {dir. mkdirs ();} // extract the compressed file unout = new fileoutputstream (new file (destfilename); archive. extractfile (fileheader, unout); unout. flush (); unout. close ();} fileheader = archive. nextfileheader ();} archive. close ();} catch (rarexception e) {e. printstacktrace ();} finally {ioutils. closequietly (unout );}}}

Related Resources:

Http://code.google.com/p/java-unrar/downloads/list

Or

Http://download.csdn.net/detail/zhangyihui1986/4415967